Student gender
1 = Female
2 = Male
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Parents are interested in school activities
1 = Strongly disagree
2 = Disagree
3 = Agree
4 = Strongly agree
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Parental emotional support score
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

How informed about greenhouse gases
1 = Never heard of this
2 = Heard of, but not really able to explain this
3 = Know something, could explain in general
4 = Familiar with this, could explain well

Air pollution will improve in 20 years
1 = Improve
2 = Stay about the same
3 = Get worse
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Interest in biosphere
1 = Not interested
2 = Hardly interested
3 = Interested
4 = Highly interested
5 = I don't know what this is
95 = Valid Skip
96 = Not Reached
97 = Not Applicable
98 = Invalid
99 = No Response

Science useful for later work
1 = Strongly Agree
2 = Agree
3 = Disagree
4 = Strongly Disagree
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

Immigation status
1 = Native
2 = Second-Generation
3 = First-Generation
5 = Valid Skip
6 = Not Reached
7 = Not Applicable
8 = Invalid
9 = No Response

1 = Low: GCSE or equiv
2 = Medium: A-level or equiv
3 = High: University degree